A Mossad surveillance team made quite a public spectacle of themselves on 9-11.

TheNew York Times reported Thursday that a group of five men had set up
video cameras aimed at the Twin Towers prior to the attack on Tuesday,
and were seen congratulating one another afterwards. (1)

Police received several calls from angry New Jersey residents claiming
"middle-eastern" men with a white van were videotaping the disaster with
shouts of joy and mockery. (2)

"They were like happy, you know ... They didn't look shocked to me" said a witness. (3)

They were seen by New Jersey residents on Sept. 11 making fun of the World
Trade Center ruins and going to extreme lengths to photograph themselves
in front of the wreckage. (4)

Witnesses saw them jumping for
joy in Liberty State Park after the initial impact (5). Later on, other
witnesses saw them celebrating on a roof in Weehawken, and still more
witnesses later saw them celebrating with high fives in a Jersey City
parking lot. (6)

"It looked like they're hooked in with this. It
looked like they knew what was going to happen when they were at
Liberty State Park." (7)